from .phonetic_algorithm import PhoneticAlgorithm
from ..utils import check_str, check_empty
from typing import List
import string
    
# defined vowels as well as additional characters defined in the specification ("æ","ā","ø")
__vowels : List[str] = ["a","e","i","o","u","æ","ā","ø"]  

class Caverphone2(PhoneticAlgorithm):
    """
    """

    def __init__(self):
        super().__init__()

    def phonetics(self, word):
        # Step 1.
        check_empty(word)
        check_str(word)

        input = word

        # Step 2.
        input = input.lower()

        # Step 3. 
        for char in input :
            if (char not in string.ascii_lowercase) :
                input = input.replace(char,"") 
        
        # Step 4.
        if input.endswith("e") :
            input = input.removesuffix("e")

        # Step 5. (1-6)
        ough_gn_replace : List[str] = [
            "cough","cou2f","rough","rou2f","tough","tou2f",
            "enough","enou2f","trough","trou2f","gn","2n"
        ]
        for idx,itm in enumerate(ough_gn_replace) :
            if (idx % 2 == 1 and input.startswith(ough_gn_replace[idx-1])) :
                input = ough_gn_replace[idx] + input.lstrip(ough_gn_replace[idx-1])
                break

        # Step 6.
        if (input.endswith("mb")) :
            input = input.removesuffix("mb") + "m2"

        # Step 7. (1-17)
        step_7_replace : List[str]= [
            "cq","2q","ci","si","ce","se","cy","sy","tch","2ch","c",'k',"q","k",
            "x","k","v","f","dg","2g","tio","sio","tia","sia","d","t","ph","fh",
            "b","p","sh","s2","z","s"
        ]
        for idx,itm in enumerate(step_7_replace) :
            if idx % 2 == 1 :
                input = input.replace(step_7_replace[idx-1],step_7_replace[idx])

        # Step 7. (18-19)
        step_7_output : str = ""
        for index, char in enumerate(input) :
            if char in __vowels :
                step_7_output += "A" if index == 0 else "3"  
            else :
                step_7_output += char
        input = step_7_output

        # Step 7. (20)
        input = input.replace("j","y")

        # Step 7. (21-22)
        if (input.startswith("y3")) :
            input = input.replace("y3","Y3",1)
        if (input.startswith("y")) :
            input = input.removeprefix("y","A")

        # Step 7. (23)
        input = input.replace("y","3")

        # Step 7. (24)
        input = input.replace("3gh3","3kh3")

        # Step 7. (25)
        input = input.replace("gh","22")

        # Step 7. (26)
        input = input.replace("g","k")

        # Step 7. (27-33)
        identical_adj_chars : List[str] = ["s","t","p","k","f","m","n"]

        output : str = ""
        for index, char in enumerate(input) :
            if char in identical_adj_chars : 
                upper_char : chr = char.upper()
                if len(output) > 0 and output[-1] == upper_char :
                    continue
                output += upper_char
                continue
            output += char
        input = output
        
        # Step 7. (34)
        input = input.replace("w3","W3")

        # Step 7. (35)
        input = input.replace("wh3","Wh3")

        # Step 7. (36)
        if input.endswith("w") :
            input = input.removesuffix("w") + "3"

        # Step 7. (37)
        input = input.replace("w","2")

        # Step 7. (38)
        if (input.endswith("h")) :
            input = input.removeprefix("h") + "A"

        # Step 7. (39)
        input = input.replace("h","2")

        # Step 7. (40)
        input = input.replace("r3","R3")

        # Step 7. (41)
        if input.endswith("r") :
            input = input.removesuffix("r") + "3"

        # Step 7. (42)
        input = input.replace("r","2")

        # Step 7. (43)
        input = input.replace("l3","L3")

        # Step 7. (44)
        if input.endswith("l") :
            input = input.removesuffix("l") + "3"

        # Step 7. (45)
        input = input.replace("l","2")

        # Step 8.
        input = input.replace("2","")

        # Step 9.
        if input.endswith("3") :
            input = input.removesuffix("3") + "A"

        # Step 10.
        input = input.replace("3","")
        
        # Steps 11-12.
        input = input.ljust(10,"1")

        return input